/*
 * jQuery UI Selectable 1.6
 *
 * Copyright (c) 2008 AUTHORS.txt (http://ui.jquery.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Selectables
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

    $.widget("ui.selectable", $.extend({}, $.ui.mouse, {
        _init: function() {
            var self = this;

            this.element.addClass("ui-selectable");

            this.dragged = false;

            // cache selectee children based on filter
            var selectees;
            this.refresh = function() {
                selectees = $(self.options.filter, self.element[0]);
                selectees.each(function() {
                    var $this = $(this);
                    var pos = $this.offset();
                    $.data(this, "selectable-item", {
                        element: this,
                        $element: $this,
                        left: pos.left,
                        top: pos.top,
                        right: pos.left + $this.width(),
                        bottom: pos.top + $this.height(),
                        startselected: false,
                        selected: $this.hasClass('ui-selected'),
                        selecting: $this.hasClass('ui-selecting'),
                        unselecting: $this.hasClass('ui-unselecting')
                    });
                });
            };
            this.refresh();

            this.selectees = selectees.addClass("ui-selectee");

            this._mouseInit();

            this.helper = $(document.createElement('div'))
                    .css({border: '1px dotted black'})
                    .addClass("ui-selectable-helper");
        },
        destroy: function() {
            this.element
                    .removeClass("ui-selectable ui-selectable-disabled")
                    .removeData("selectable")
                    .unbind(".selectable");
            this._mouseDestroy();
        },
        _mouseStart: function(event) {
            var self = this;

            this.opos = [event.pageX, event.pageY];

            if (this.options.disabled)
                return;

            var options = this.options;

            this.selectees = $(options.filter, this.element[0]);

            // selectable START callback
            this.element.triggerHandler("selectablestart", [event, {
                    "selectable": this.element[0],
                    "options": options
                }], options.start);

            $('body').append(this.helper);
            // position helper (lasso)
            this.helper.css({
                "z-index": 100,
                "position": "absolute",
                "left": event.clientX,
                "top": event.clientY,
                "width": 0,
                "height": 0
            });

            if (options.autoRefresh) {
                this.refresh();
            }

            this.selectees.filter('.ui-selected').each(function() {
                var selectee = $.data(this, "selectable-item");
                selectee.startselected = true;
                if (!event.metaKey) {
                    selectee.$element.removeClass('ui-selected');
                    selectee.selected = false;
                    selectee.$element.addClass('ui-unselecting');
                    selectee.unselecting = true;
                    // selectable UNSELECTING callback
                    self.element.triggerHandler("selectableunselecting", [event, {
                            selectable: self.element[0],
                            unselecting: selectee.element,
                            options: options
                        }], options.unselecting);
                }
            });

            var isSelectee = false;
            $(event.target).parents().andSelf().each(function() {
                if ($.data(this, "selectable-item"))
                    isSelectee = true;
            });
            return this.options.keyboard ? !isSelectee : true;
        },
        _mouseDrag: function(event) {
            var self = this;
            this.dragged = true;

            if (this.options.disabled)
                return;

            var options = this.options;

            var x1 = this.opos[0], y1 = this.opos[1], x2 = event.pageX, y2 = event.pageY;
            if (x1 > x2) {
                var tmp = x2;
                x2 = x1;
                x1 = tmp;
            }
            if (y1 > y2) {
                var tmp = y2;
                y2 = y1;
                y1 = tmp;
            }
            this.helper.css({left: x1, top: y1, width: x2 - x1, height: y2 - y1});

            this.selectees.each(function() {
                var selectee = $.data(this, "selectable-item");
                //prevent helper from being selected if appendTo: selectable
                if (!selectee || selectee.element == self.element[0])
                    return;
                var hit = false;
                if (options.tolerance == 'touch') {
                    hit = (!(selectee.left > x2 || selectee.right < x1 || selectee.top > y2 || selectee.bottom < y1));
                } else if (options.tolerance == 'fit') {
                    hit = (selectee.left > x1 && selectee.right < x2 && selectee.top > y1 && selectee.bottom < y2);
                }

                if (hit) {
                    // SELECT
                    if (selectee.selected) {
                        selectee.$element.removeClass('ui-selected');
                        selectee.selected = false;
                    }
                    if (selectee.unselecting) {
                        selectee.$element.removeClass('ui-unselecting');
                        selectee.unselecting = false;
                    }
                    if (!selectee.selecting) {
                        selectee.$element.addClass('ui-selecting');
                        selectee.selecting = true;
                        // selectable SELECTING callback
                        self.element.triggerHandler("selectableselecting", [event, {
                                selectable: self.element[0],
                                selecting: selectee.element,
                                options: options
                            }], options.selecting);
                    }
                } else {
                    // UNSELECT
                    if (selectee.selecting) {
                        if (event.metaKey && selectee.startselected) {
                            selectee.$element.removeClass('ui-selecting');
                            selectee.selecting = false;
                            selectee.$element.addClass('ui-selected');
                            selectee.selected = true;
                        } else {
                            selectee.$element.removeClass('ui-selecting');
                            selectee.selecting = false;
                            if (selectee.startselected) {
                                selectee.$element.addClass('ui-unselecting');
                                selectee.unselecting = true;
                            }
                            // selectable UNSELECTING callback
                            self.element.triggerHandler("selectableunselecting", [event, {
                                    selectable: self.element[0],
                                    unselecting: selectee.element,
                                    options: options
                                }], options.unselecting);
                        }
                    }
                    if (selectee.selected) {
                        if (!event.metaKey && !selectee.startselected) {
                            selectee.$element.removeClass('ui-selected');
                            selectee.selected = false;

                            selectee.$element.addClass('ui-unselecting');
                            selectee.unselecting = true;
                            // selectable UNSELECTING callback
                            self.element.triggerHandler("selectableunselecting", [event, {
                                    selectable: self.element[0],
                                    unselecting: selectee.element,
                                    options: options
                                }], options.unselecting);
                        }
                    }
                }
            });

            return false;
        },
        _mouseStop: function(event) {
            var self = this;

            this.dragged = false;

            var options = this.options;

            $('.ui-unselecting', this.element[0]).each(function() {
                var selectee = $.data(this, "selectable-item");
                selectee.$element.removeClass('ui-unselecting');
                selectee.unselecting = false;
                selectee.startselected = false;
                self.element.triggerHandler("selectableunselected", [event, {
                        selectable: self.element[0],
                        unselected: selectee.element,
                        options: options
                    }], options.unselected);
            });
            $('.ui-selecting', this.element[0]).each(function() {
                var selectee = $.data(this, "selectable-item");
                selectee.$element.removeClass('ui-selecting').addClass('ui-selected');
                selectee.selecting = false;
                selectee.selected = true;
                selectee.startselected = true;
                self.element.triggerHandler("selectableselected", [event, {
                        selectable: self.element[0],
                        selected: selectee.element,
                        options: options
                    }], options.selected);
            });
            this.element.triggerHandler("selectablestop", [event, {
                    selectable: self.element[0],
                    options: this.options
                }], this.options.stop);

            this.helper.remove();

            return false;
        }

    }));

    $.extend($.ui.selectable, {
        version: "1.6",
        defaults: {
            appendTo: 'body',
            autoRefresh: true,
            cancel: ":input",
            delay: 0,
            distance: 1,
            filter: '*',
            tolerance: 'touch'
        }
    });

})(jQuery);
